Hi Jason, Thank you very much for your answer. I think we are running similar versions of the kernel since our PRU configurations seem to be about the same.
So, I installed the Debian 9.5 2018-10-07 4GB SD IoT image and I am using the 4.14 kernel version. I took a look at the article from you have sent me and it seems to work. In the section "02start" I could set the USR3 led blinking, although in the section "06io" I couldn't set the P9.11 LED blinking, I follow his instructions and it didn't work, do you have any inkling what might I do wrong? >From what I have seen, he separates the registers by addresses, as described above: #define GPIO0 0x44e07000 // GPIO Bank 0 #define GPIO1 0x4804c000 // GPIO Bank 1 #define GPIO2 0x481ac000 // GPIO Bank 2 #define GPIO3 0x481ae000 //GPIO Bank 3 He says to check the Table 2.2 of TRM, do you know where it is? I think the failure might be in the address for accessing the GPIO0, which might be different on my kernel version. Additionally, can you tell me what you've done with PRU? ... What I do want to achieve is to build an SPI slave interface (for reading data from image sensors). Thank you very much for your help, Fred Gomes Jason Kridner <[email protected]> escreveu no dia quinta, 15/11/2018 à(s) 18:57: > On Thu, Nov 15, 2018 at 9:38 AM Bill Bitner <[email protected]> wrote: > > > > Hi Fred! > > > > What version of the linux kernel are you using? It makes a large > > difference as the kernel interfaces have changed. > > My experience may not apply to your's but I can share it with you. > > I have a beagle board black. The board booted fine and then I > installed > > the latest at the time "debian 9.4 lxqt". The board booted fine. > The PRU > > compilers where *already* installed. However, I could not access the > PRU > > from the device tree. From > > https://markayoder.github.io/PRUCookbook/ > > In Mark's excellent guide, I was able to see the following instructions > > in the Makefile. > > """ > > # Lookup PRU by address > > ifeq ($(PRUN),0) > > PRU_ADDR=4a334000 > > endif > > ifeq ($(PRUN),1) > > PRU_ADDR=4a338000 > > endif > > > > PRU_DIR=$(wildcard > /sys/devices/platform/ocp/4a32600*.pruss-soc-bus/4a300000.pruss/$(PRU_ADDR).*/remoteproc/remoteproc*) > > """ > > > > I could not see these addresses despite modifications to the uEnv.txt > file. I finally discovered that despite booting from the SD card, > > the boot process would use information from the built-in flash chip. > Once I zeroed out the on-board flash chip, (using the following) > > sudo dd if=/dev/zero of=/dev/mmcblk1 count=1 seek=1 bs=128k > > I could make changes to the uEnv.txt file and everything started working > as one would expect. > > Typically (unless the bootloader on the microSD also tries to load > from eMMC), you can hold down the BOOT/SD/S2 button when applying > power (release right after applying power) and it will force the > bootloader on the eMMC to be ignored. > > > > > Bill Bitner > > > > On Wed, Nov 14, 2018 at 8:19 PM <[email protected]> wrote: > >> > >> Hi guys, > >> > >> I am having some problems in getting started with PRU. > >> > >> So, first of all, I installed one PRU compiler (CSS) (I follow this > article: > http://processors.wiki.ti.com/index.php/PRU_Training:_Hands-on_Labs > >> > >> After having the compiled the file, and from what I've read throughout > the internet, I thought that in order to run a program into the PRU I > should simply do: > >> > >> - cp mycode.out /lib/firmware/am335x-pru0-fw > >> - echo 'start' > /sys/class/remoteproc/remoteproc1/state > >> > >> However, If I try it with a code to blink a led it does nothing > (example of the code for blinking a LED above). > >> > >> volatile register unsigned int __R30; > >> > >> int main(void) { > >> __R30 = SET_MASK; > >> > >> while(1) { > >> __R30 = __R30 & ~(SET_MASK); > >> __delay_cycles(100000000); // half-second delay > >> } > >> } > >> > >> I've also tried to follow this tutorial: > http://www.righto.com/2016/09/how-to-run-c-programs-on-beaglebones.html > >> and I get an error when I do: ./loader text.bin data.bin, it says an > error message of "prudrv failed to open". But I can't quit understand what > that program does. > >> > >> Can anyone tell me what am I doing wrong ? > >> > >> Thanks you very much, > >> Fred Gomes > >> > >> -- > >> For more options, visit http://beagleboard.org/discuss > >> --- > >> You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > >> To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > >> To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/467fd871-1c67-489b-9fad-82104bfd7ba2%40googlegroups.com > . > >> For more options, visit https://groups.google.com/d/optout. > > > > -- > > For more options, visit http://beagleboard.org/discuss > > --- > > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CAOYP4di%2BoF5UDX2pv1yd9A5FGyogt31yi_ekXUokFjfxYMq%3DFA%40mail.gmail.com > . > > For more options, visit https://groups.google.com/d/optout. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/2M6ae9KCfiM/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CA%2BT6QPn8uYRZr-W%3DYm8FBtp_2sZbghR%3Du3KiwuUnsOq_SvRc8Q%40mail.gmail.com > . > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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